/* 3D lab */
.process-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.process-steps li {
  border: 1px solid var(--line);
  border-radius: 14px;
  background: #fff;
  overflow: hidden;
}
.process-steps button {
  display: flex; align-items: center; gap: 12px;
  width: 100%;
  margin: 0; padding: 16px 18px;
  border: 0; background: transparent;
  font: inherit; font-weight: 800; color: var(--ink);
  text-align: left; cursor: pointer;
}
.process-steps button span {
  color: var(--teal);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 500;
}
.process-steps p { margin: 0; padding: 0 18px 18px 54px; display: none; }
.process-steps li.is-active { border-color: var(--teal); background: var(--teal-pale); }
.process-steps li.is-active p { display: block; }

.material-explorer { display: grid; gap: 18px; }
.material-tabs { display: flex; flex-wrap: wrap; gap: 8px; }
.material-tabs [role="tab"] {
  min-height: 42px;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  font: inherit; font-weight: 800; font-size: .88rem;
  cursor: pointer;
}
.material-tabs [role="tab"][aria-selected="true"] {
  background: var(--ink);
  color: #fff;
  border-color: var(--ink);
}
.material-panel {
  padding: 24px 26px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.material-panel[hidden] { display: none; }

.model-frame {
  margin: 0 auto;
  max-width: 760px;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: #fff;
}
.model-frame figcaption { margin: 10px 8px 4px; font-size: .86rem; color: var(--ink-soft); }
.model-placeholder {
  max-width: 760px;
  margin: 0 auto;
  padding: 36px 28px;
  border: 1px dashed var(--line);
  border-radius: 16px;
  background: var(--mist);
  text-align: center;
}